High zaus RF board thermal tsis ua hauj lwm kev zam lub qhov: yuav ua li cas kom haum lub substrate nrog haum thermal conductivity coefficient
Core parameters ntawm thermal conductivity rau ntau hom khoom
| Hom khoom | Hom thermal conductivity | Cov yam ntxwv tseem ceeb |
|---|---|---|
| Aluminium nitride (AlN) ceramic substrate | 150 ~ 180 W / mK | Tsis tshua muaj thermal conductivity, CTE ze rau silicon chips, txo cov thermal stress |
| Aluminium oxide ceramic substrate | ~ 20 ~ 30 W / mK | Qhov kub thiab txias tsis kam, haum rau siab- zaus, hnyav, siab- fais fab xwm txheej siab tshaj 50GHz |
| High zog aluminium raws li substrate | Ntau tshaj lossis sib npaug rau 0.8 W / mK | Tus nqi nruab nrab, tsim nyog rau nruab nrab mus rau siab zog cov qauv RF |
| Ceramic puv PTFE (xws li Taconic RF-60) | 0.4 W / mK | Sib npaug qis dielectric poob thiab thermal conductivity yooj yim, haum rau siab -frequency scenarios hauv kev sib txuas lus thiab kev lag luam tswj |
| Rogers RO5870 | 0.22 W / mK | Tsawg dielectric poob, haum rau 8-40GHz pa hluav taws xob radar thiab 5G millimeter nthwv dej scenarios |
| Rogers RO5880 | 0.2 W / mK | Ultra low Df, optimized rau millimeter nthwv dej tsawg poob scenarios |
| Hloov kho FR4 | 0.3 ~ 0.5 W / mK | Tus nqi qis heev, tsuas yog tsim nyog rau qis- zog thiab qis- zaus zaus hauv qab 2.5GHz |
Kev txiav txim siab tseem ceeb rau kev xaiv thermal conductivity coefficient
Qhov tseem ceeb sib piv ntawm lub zog hluav taws xob: Rau cov xwm txheej kub kub xws li siab - lub zog amplifiers thiab cov radars hauv huab cua, AlN ceramic substrates tau nyiam kom tsis txhob muaj cua sov hauv zos uas yuav ua rau cov cuab yeej tsis ua haujlwm; Nyob rau hauv qis mus rau nruab nrab lub zog sib txuas lus scenarios, PTFE raws siab - cov ntaub ntawv zaus nrog lub zog ntawm 0.2 ~ 0.5 W / mK tuaj yeem ua tau raws li qhov yuav tsum tau ua.
Muab rau hauv tus account siab - zaus hluav taws xob ua haujlwm: Df Performance index tsis tuaj yeem muab txi rau kev nrhiav cov thermal conductivity. Lub millimeter yoj zaus band yuav tsum xyuas kom Df Tsawg dua lossis sib npaug rau 0.002. Nyob rau hauv cov ntaub ntawv no, lub thermal conductivity yuav tsum tau maximized kom tsis txhob teeb liab poob raug hloov mus rau hauv lub tshav kub ntxiv.
CTE synchronous matching: Lub thermal expansion coefficient ntawm cov khoom xaiv yuav tsum nyob ze rau ntawm cov core chips xws li GaAs thiab silicon los tiv thaiv solder tawg thaum lub sij hawm kub cycling. Ceramic substrates muaj qhov zoo ntawm qhov no.
Simulation pov thawj qhov tseem ceeb: Simulation cov ntaub ntawv qhia tau hais tias nyob rau hauv tib lub Df tej yam kev mob, nce lub thermal conductivity ntawm 0.2 W / mK mus rau 1.5 W / mK yuav txo tau qhov kub nce nyob rau hauv ib chav tsev input zog los ntawm 0.82℃/ W. Raws li 50W input zog, tag nrho cov cua txias tuaj yeem ncav cuag 40 degree, uas yog qhov zoo dua li tsuas yog txo cov cua sov dissipation nyhuv ntawm Df.
Kev xaiv zoo tshaj plaws rau cov xwm txheej raug
Cov xwm txheej siab zog rau tub rog radar / satellite kev sib txuas lus: Xaiv AlN ceramic substrate nrog cov thermal conductivity ntawm 150-}180 W/mK, thiab muab nws nrog ceramic ntim PTFE dielectric txheej kom ua tiav cov teeb liab qis thiab qhov kawg ntawm cov cua kub dissipation.
5G millimeter yoj / 77GHz tsheb mounted radar scenario: Rogers RO5870 yog qhov nyiam, nrog cov thermal conductivity ntawm 0.22 W / mK uas tuaj yeem ua tau raws li cov qauv siv hluav taws xob cua txias thaum ua kom Df Tsawg dua lossis sib npaug rau 0.0012, ntsuas kev ua haujlwm thiab tus nqi.
Kev tswj kev lag luam / me me thiab nruab nrab lub zog sib txuas lus scenarios: Xaiv cov khoom siv ceramic uas muaj PTFE xws li Taconic RF-60, nrog cov thermal conductivity ntawm 0.4 W / mK uas haum rau feem ntau cov xwm txheej, thaum tseem muaj qhov zoo heev dielectric qhov ruaj khov thiab muaj zog ua tau zoo.
Tus nqi qis, qis- zaus, qis- lub zog scenario: Cov thermal conductivity siab hloov FR4 raug xaiv, nrog cov thermal conductivity coefficient ntau dua los yog sib npaug rau 0.8 W / mK, haum rau tsis hnyav RF xwm txheej hauv qab 2.5GHz, zoo heev tswj cov nqi khoom.